997787800 has 48 divisors (see below), whose sum is σ = 2456327160. Its totient is φ = 375636480.

The previous prime is 997787773. The next prime is 997787801. The reversal of 997787800 is 8787799.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997787801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143334 + ... + 150133.

Almost surely, 2^997787800 is an apocalyptic number.

It is an amenable number.

997787800 is an abundant number, since it is smaller than the sum of its proper divisors (1458539360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997787800 is a wasteful number, since it uses less digits than its factorization.

997787800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293500 (or 293491 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 997787800 is about 31587.7792825010. The cubic root of 997787800 is about 999.2620555720.

The spelling of 997787800 in words is "nine hundred ninety-seven million, seven hundred eighty-seven thousand, eight hundred".